Coal-burning heating-furnace.



E. C. WALKER & A. S. MOSES.

COAL BURNING HEATING FURNACE.

APPLICATION FILED JUNE 11, 1913.

1 1 96,786 Patented Aug. 29, 1916.

2 SHEETSSHEET I.

E. C. WALKER & A. S. MOSES.

COAL BURNING HEATING FURNACE.

APPLICATION FILED JUNE I1. 1913.

Patented Aug. 29, 1916.

2 SHEEfS-SHEET 2.

EDWARD C. WALKER AND ASHELEIGH S. MOSES, OF ST. LOUIS, MISSOURI, ASSIGNORS TO GEORGE M. ILLGES, OF ST. LOUIS, MISSOURI.

COAL-BURNING HEATING-FURNACE.

Application filed June 11, 1913.

To all whom it may concern Be it known that we, EDWARD C. WALKER and AsnnLnrcrr S. Mosns, citizens of the United States, and residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Coal- Burning Heating-Furnaces, of which the following is a specification.

This invention relates to furnaces and more particularly to coal burning furnaces adapted to furnish heat by gases forming a reducing atmosphere.

In the operation of certain types of metallurgical furnaces, such for instance as are used in the smelting of zinc, it is necessary to maintain a heating gas in the heating chamber of the furnace under pressure, and this heating gas must furnish a reducing atmosphere. It is of great importance that the quality together with the temperature of the gas be capable of accurate control in order that the temperature and composition of the heating gas in the heating chamber of the furnace be maintained constant and at a predetermined value.

One of the objects of this invention there fore is to construct a furnace of the above type which will deliver heating gases to the heating chamber, which furnace is provided with means for automatically as well as manually regulating and controlling the quality and temperature of the heating gases delivered.

Another object is to construct a furnace of the above type which will be automatic in its operation, in which this automatic operation can be varied at will, and which will require a minimum of attendance.

Further objects will appear from the detail description taken in connection with the accompanying drawings, in which:

Figure 1 is a longitudinal vertical section through a furnace embodying this invention, the section being taken on the line 1-1 Fig. 2, Fig. 2 is a transverse section on the line 22 Fig. 1, Fig. 3 is a section on the line 33 Fig. 2, parts being shown in elevation, Fig. 4 is an end elevation of a part of the operating mechanism looking in the direction of the arrow 4 Fig. 1, and Fig. 5 is a plan of the part of the operating mechanism shown in Fig. 4.

Specification of Letters Patent.

Patented Aug. 29, 1916.

Serial No. 773,119.

Referring to the accompanying drawings, 10 designates the heating chamber of a fur nace of the reverberatory type having a hearth 11 and an arch 12. This furnace may be of well known construction. The burner or heater structure comprises a body 13 of masonry arranged to form a vertical fuel chamber or shaft 14 having end walls 15 and 16. The end wall 15 terminates below the roof to form an outlet passage 17, and provides a bridge wall between the fuel chamber and the heating chamber of the reverberatory furnace. The bottom of the furnace is provided with wind boxes 18 which are preferably formed of a cast iron framework set into the back wall 15 and having twyers 19 opening into the fuel chamber. The inside faces of the wind boxes are preferably faced with fire brick 20 set into the metal. A casing 21 extending under and around the back wall 15 and having an end wall 22 is bolted to the wind boxes to form an ash pit. End brackets or standards 23 are provided with wheels 25 resting on tracks 26, whereby the heater structure may be moved toward and from the furnace chamber 10. A joint 27 is made between the heater structure and the furnace chamber structure, and this joint is filled with mud or mortar when the parts are in position. The fuel chamber or shaft 14 is shaped as shown in the drawings so as to form a vertical shaft contracted at the bottom, having a row of twyers on each side and open at the bottom to the ash pit.

The fuel chamber 14 has a feed opening 30 in its roof and this opening has a metal supportor lining 31 provided with cross braces 32, and this lining is further provided with brackets 33 forming end bearings 34 for a feeding member 35. This feeding member is positioned underneath a hop per 36 supported by the lining. The hopper is inclosed by a casing 37 having an air pipe connection 38 provided with a regulating valve 39. The feeding member has a shaft 40 having rigidly mounted thereon an arm 41 connected by a link 42 with an arm 43 on a rock shaft 44 supported in bearing brackets 45 on the heater structure. The arm 41 is slotted, and the connection between this arm and the link 42 is made through a clamping bolt 4-6, whereby this clamping bolt may be adjusted in the slot to adjustthe movement of the feeding member 35. This feeding means is of well known construction and its operation is well understood. As the feeding member 35 is oscillated laterally under the hopper it operates to feed coal from the hopper, and the amount of feed is varied by varying the extent of the lateral movements of the feeding member.

A ram 50 extends across the lower end of the shaft 14: and is provided with arms 51 keyed to a shaft 52. The upper face of the ram is curved on an are having the shaft 52 as a center, and the length and width of this upper face are substantially equal to the length and width of the bottom of the shaft opening. The shaft 52 is loosely supported in arms 53 keyed to a shaft 54 mounted in bearings 55 and 56 in the back wall 15 and the end casing wall 22. The shaft 54- has rigidly secured thereto a slotted arm 57 connected by a link 58 to an arm 59 on the rock shaft 44. The connection be tween the arm 57 and the link 58 is made through a bolt 60 adjustable in the slot in the arm 57 and adapted to be clamped in adjusted position. The shaft 52 extends outside of the casing end, wall 22 and has rigidly connected therewith an arm 61 connected through a link 62 with an arm 63 on the rock shaft 44. The connection between the arm 61 and the link 62 is made through an adjustable bolt and slot connection similar to that between the arm 57 and the link 58. The shaft 4-1 is provided with a slotted arm 6 l=having an adjustable connection with an endwise movable operating rod 65, which is inv turn reciprocated from any suitable source of power. In order to permit movement of the shaft 52 in the end wall 22 this end wall is slotted as shown at 66 and the shaft 52 is provided with a plate 67 closing the opening.

Reciprocation of the rod will cause an oscillation of the rock shaft 44. This in turn will cause an oscillation of the feeding member 35 and of the shafts 52 and 54. As

the parts move in the directions of the arrowsFig. 2 the feeding member and the ram will move in the directions of the arrows thereon. It will be noted that when the arms 53 are oscillated in the direction of the arrow, the shaft 52 and therefore the arm 61 will move vertically with the arms 53. If now the arms 57 and 61 are equal in length, and if the arms 53 are of such a length that when the links 58 and 62 are moved the same distances the shaft 52 will be moved the same distance vertically as the link 62, then the lateral oscillation of the ram will be zero. The arm 63 must therefore be longer than the arm 59 so as to cause an oscillation of the ram 50 laterally in the direction of the arrow. In practice the arm 63 is made twice as long as the arm 59. The arm 63 is however provided with a hole 69 intermediate its length for a purpose hereinafter to be described. The oscillation of the feeding member 35 and the vertical and horizontal movement of the ram can be independently varied by the independent adjustable connections of the operating links with the slotted arms ll, 57 and 61. The movements of all these members may be dependently controlled by varying the throw of the rock shaft 4 1 by adjusting the c011- nection between the slotted arm 6% and the link 65. Either the vertical or the lateral movement of the ram 50 may be interrupted. Thus to interrupt the vertical movement of the ram the end of the link 58 is disconnected from its arm 59 and is secured by a bolt 68 screwed directly into the shaft 44. The oscillation of the arm 57 will therefore be suspended. It is in that case however necessary to shorten the arm 63 by moving the pivotal connection between the link and the arm to the point 69 on the arm 63, in order to maintain the lateral movement of the ram the same that it was before. This is for the reason that the movement given the ram by the arm 59 need not now be compensated for. I 11 order to interrupt the lateral movement of the ram the connection between the link 58 and the arm 59 is maintained and the link 62 is connected to the arm 63 at the point 69 which has the same radius as the arm 59. It will now be noted that the vertical movement of the link 62 given by the arm 63 is exactly equal to the vertical movement given to the shaft 52 by the arm 59 (provided the adjustments to the arms 57 and 61 are made to accomphsh this) so that the ram will have no lateral movement but will still have a vertical movement.

The wind boxes open into the ash pit through openings 70 and said pit is provided with a discharge opening 71 closed by a slide 72 whose operating handle 73 projects beyond the front wall 22. Air is admitted to the wind boxes by branch pipes 75 leading from a main supply pipe 76 which also has a branch 77 leading to the pipe 38, there being provided in the pipes 7 5 suitable controlling and cut-off valves 78 and 79 respectively.

lll)

hydrocarbons and a free carbon monoxid in order to produce a reducing atmosphere in the heating chamber of the furnace. The ram is moved vertically to stoke the fire and laterally to purge the fire. As the ram moves vertically it Will break up and stir up the bed of fuel and as it moves laterally it will shake out and discharge the ashes. The amount of stoking and purging can be varied by varying the vertical and lateral movements of the ram. The air is delivered to the bed of fuel both by the twyers 19 and from the ash pit since this ash pit is maintained under the pressure of the air entering from the wind boxes. This will result in a complete combustion of the coal.

In the operation of the furnace a bed of coal is formed of such a thickness, and the furnace is so controlled as to cause the gases to be discharged at the required temperature, of the required composition and in the required quantity. These factors may be controlled by varying the feed of the coal, by varying the stoking, and purging operations and by varying the normal quantity of air as delivered by the. tWyers and by the ash pit. The feeding means, and ram operating mechanisms are therefore so adjusted, that a gas of the desired quantity and composition, and at the required temperature 1s delivered. If the quantity of heating gas to be delivered is thereafter to be varied it is only necessary to vary the feeding, stoking and purging operating means, and regulate the pressure and quantity of air delivered to the furnace chamber. This adjustment of the feeding, stoking and purging means can be simultaneously accomplished by varying the throw of the rock shaft 44 by adjusting the rod with respect to the arm 64:. The air connections need not ordinarily be varied, except When the feeding, stoking and purging means are varied, as the quantity and pressure of the air Will adjust itself automatically to the varying conditions in the furnace. It Will therefore be seen that the quantity of heating gas delivered can be varied while its quality and temperature will remain practically the same.

, It is obvious that various changes may be made in the details of construction Within the scope of the claims Without departing from this invention, and it is therefore to be understood that this invention is not to be limited to the specific construction shown and described.

Having thus described the invention What is claimed is:

1. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft fed from the top, and a ram operatively arranged to normally support the bed of fuel and operable for stoking the fuel in said shaft vertically from beneath the fuel bed.

2. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, and a stoking ram operatively arranged at the bottom of said shaft for normally supporting the bed of fuel, said ram being movable vertically beneath the fuel bed to stoke the fuel in said shaft.

3. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, and a ram operatively arranged at the bot tom of said shaft for normally supporting the bed of fuel, said ram being movable vertically beneath the fuel bed to stoke and horizontally to purge.

In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft contracted at the bottom, and a ram operatively arranged at the bottom of said shaft for supporting the bed of fuel, said ram being operable for stoking the fuel vertically from beneath.

5. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, a ram extending across the bottom of said shaft and operatively arranged for normally supporting the bed of fuel, and means for moving said ram vertically to stoke the fuel from beneath.

6. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, a ram extending across the bottom of said shaft and operatively arranged for normally supporting the bed of fuel, and means for moving said ram vertically beneath the fuel bed to stoke and ho izon ally to purge.

7. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, a ram operatively arranged at the bottom of said shaft for normally supporting the bed of fuel, and adjustable means for moving said ram vertically to stoke the fuel.

- 8. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, a ram operatively arranged at the bottom of said shaft for normally supporting the bed of fuel, and adjustable means for moving said ram vertically beneath the fuel bed to stoke and horizontally to purge.

9. In a coal burning metallurgical heating furnace, a fuel chamber, a member at the bottom of said chamber, means for moving said member vertically to stoke, and means for moving said member horizontally to purge.

10. In a coal burning metallurgical heating furnace, a fuel chamber, a member at the bottom of said chamber, means for moving said member vertically to stoke, and means for moving said member horizontally to purge, said moving means being independently adjustable.

11. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, a ram operatively arranged at the bottom of said shaft for normally supporting the bed of fuel, means for moving said ram vertically to stoke, and means for moving said ram horizontally to purge, said moving means being dependently adjustable to vary the stoking and purging operations.

12. In a coal burning metallurgical heating furnace, a fuel chamber, a member at the bottom of said chamber, means for moving said member vertically to stoke, and means for moving said member horizontally to purge, said moving means being independently and dependently adjustable.

13. In a coal burning metallurgical heating furnace, a fuel chamber, means for stoking and purging the fuel from the bottom of said chamber, means for operating said stoking and purging means, and means for varying the operation of said stoking and purging means constructed to independently vary the stoking and purging operations.

14. In a coal burning metallurgical heating furnace, a fuel chamber, means for stoking and purging the fuel from the bottom of said chamber, means for operating said stoking and purging means, and means for varying the operation of said stoking and purging means constructed to dependently and independently vary the stoking and purging operations.

15. In a coal burning metallurgical heating furnace, a fuel chamber, means for feeding fuel to said fuel chamber, means for stoking and purging the fuel from the bottom of said chamber, and means for varying the operation of said feeding, stoking and purging means constructed to independently vary the feeding, stoking and purging operations.

16. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, means for feeding fuel to said shaft, a vertically and horizontally movable ram for stoking and purging the fuel from the bottom of said shaft, and means for varying the operation of said feeding means and said stoking and purging ram, constructed to dependently vary the feeding, stoking and purging operations.

17. In a coal burning metallurgical heating furnace, a fuel chamber, means for feeding fuel to said fuel chamber, means for stoking and purging the fuel from the bottom of said chamber, and means for arying the operation of said feeding, stoking and purging means constructed to dependently and independently vary the feeding, stoking and purging operations.

18. In a coal burning metallurgical heating furnace, a vertical fuel receiving shaft, a ram operatively arranged at the bottom of said fuel shaft for normally supporting the bed of fuel, a shaft for supporting said ram, a second shaft for supporting said ram supporting shaft, and means for oscillating both of said supporting shafts.

In testimony whereof We affix our signatures in the presence of these two Witnesses.

EDIVARD C. IVALKER. ASHELEIGH S. MOSES. Witnesses CHAs. P. ILLGES, GEO. M. ILLGES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, .D. C. 

